江苏省耕地面积变化的时空特征

Temporal-spatial Features of Cultivated Land Area Change in Jiangsu Province

基于统计数据,应用GIS及空间自相关统计分析方法,以江苏省为例,探讨了其耕地利用变化的时空特征。结果表明:①1985年以来江苏省耕地面积持续减少;苏南地区是1996年以来全省耕地减少的重点区域,但人均耕地减少的县域空间差异并不显著。②1996年以来,江苏省人均耕地面积存在显著的空间自相关特征,即人均耕地面积比较接近的县市在空间分布上比较临近,呈集中分布。

Based on GIS technology and spatial autocorrelation analysis, the temporal-spatial features of cultivated land use change in Jiangsu Province were investigated by using statistical data. Influences of cultivated land use change on grain security and ecological safety were also discussed. The area of cultivated land continually decreased in Jiangsu Prov- ince since 1985. Spatially, Southern Jiangsu was the most decreased region of cultivated land area since 1996. However, there was no significant difference in per capita cultivated land area change at county scale according to the spatial autoeorrelation analysis. There was significant positive spatial autocorrelation of per capital cultivated land since 1996. That is, the counties whose per capita cultivated land area is closer in spatial distribution are relatively close, with concentrated distribution.